Comparison of Analytical Methods for Modelling Masonary Infill by Considering In-Plane and Out-of-Plane Interaction

Abstract

Masonry infilled reinforced concrete frame buildings built prior to the introduction of modern seismic provisions have been observed to undergo damage in and around the masonry infill walls during most recent moderate to severe earthquakes. Considering interaction between masonary infill and frame is one of the challenges in the field of engineering research. Observation of past earthquake indicates that in the pre-damaged infill wall in the in-plane mode, the probability of out-of-plane failure of infill walls will increase. However various studies have shown that if the infill wall correctly restrained by the frame, there is a significant capacity, in terms of force and displacement against the out-of-plane demands. The prediction of interaction and effect of in-plane behavior on the out-of-plane beahaviour of infill, is one of the new issues in the field of seismic evaluation of masonary infills. This paper present comparative parametric review of the strength and displacement capacity models that predict the infills out-of-plane responses. Also, models that consider influence of in-plane damage on the out-of-plane capacity, it has also been investigated. The parametric comparison of different models in the capacity estimation of masonary infills in out-of-plane mode is shown that interaction of in-plane and out-of-plane beahviour of infills has a significant effect on capacity reduction of infills in out-of-plane mode and the model presented in FEMA360 for out-of-plane capacity of infills has a conservative results.

Keywords

• infilled frames
• in-plane
• out-of-plane
• arching action
• seismic response